JP3581373B2 - Pants-type disposable diaper and its manufacturing method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a diaper that is formed in a pants-type in advance, and more specifically, fits perfectly to the body when used, has less stuffiness when worn for a long time, has good skin feel, and is comfortable to wear. The present invention relates to a good pants-type disposable diaper and a method for producing the same.
[0002]
[Prior art]
Various proposals have been made for pants-type disposable diapers, and for example, Japanese Patent Application Laid-Open Nos. Sho 57-77304, 62-231005, and 4-32718 have been disclosed.
[0003]
[Problems to be solved by the invention]
By the way, when using such a pants-type diaper, in order to obtain easy detachability and a good feeling of wearing according to the user's body type, in other words, it is easy to put on at the time of wearing and it does not get stuffy after wearing and In order to obtain an appropriate tightening force for fitting to the body shape, it is necessary to provide air permeability and elasticity around the waist and belly.
[0004]
For this reason, for example, in a conventional product disclosed in Japanese Patent Application Laid-Open No. 4-32718, a number of elastic yarns are bonded and fixed at intervals of about 4 mm between an outer surface material and an inner surface material constituting a covering portion. Although the ring portion is configured to have elasticity, the elastic yarn is cut off in the process of bonding and fixing the elastic yarn between the inner surface material and the outer surface material, or the elastic yarn has to be replaced with a new elastic yarn. Sometimes. These situations are unpredictable, and the associated threading work is indispensable, in which case the operation of the production line must be stopped. Also, the work of setting these elastic yarns and the work of bonding the outer surface material and the inner surface material are both complicated and time-consuming. Therefore, it has been difficult to manufacture diapers continuously and efficiently.
[0005]
In order to solve the above problems, the present invention is a pants-type diaper having elasticity and breathability in a covering member that covers the abdomen and back of a wearer, which is easy to use when used, and is perfect for the body. It is an object of the present invention to provide a pants-type disposable diaper that is fit, has less stuffiness when worn for a long time, has good texture, and can be manufactured continuously and efficiently.
[0006]
[Means for Solving the Problems]
The present inventors have conducted intensive studies in order to achieve the above object, and as a result, in a conventional pants-type diaper, a plurality of elastic members are provided between an outer material and an inner material constituting a covering part. The yarns are adhered and fixed at small intervals to provide elasticity. As an alternative, a gas-permeable, sheet-like elastic material, preferably an elastic nonwoven fabric (stretchable) is provided between the outer surface material and the inner surface material. It has been found that the above problem can be solved by interposing and fixing the nonwoven fabric in the stretched state, and the present invention has been completed.
[0007]
That is, the diaper according to the present invention comprises a covering portion and an absorption / leakage prevention portion, and the covering portion has air permeability and a pair of openings for inserting a wearer's feet and a waist where the abdomen and the back come into contact. Having an area between the liquid-permeable surface layer and the liquid-impermeable leakproof layer, the liquid-absorbent absorbent layer having a smaller area than the surface layer and the leakproof layer. And a stretchable member for forming a gathered upright portion on both sides of the absorbent layer, wherein the absorption / leakage prevention portion covers the cover ring from the abdomen to the back in the width direction central region of the cover ring portion. A pants-type disposable diaper disposed on an inner surface of the portion and fixed to at least a crotch region, wherein the covering portion is formed of an outer surface material, an inner surface material, and a stretchable elastic material interposed therebetween, and The elastic material is applied to the wearer's abdomen Parts are formed in a wide range of coating can sheet, moreover decompression on said outer members and the inner surface material all around the waist of the absorbent leak-proof part excluding the portion corresponding to the crotch region comprises a portion arranged A pants-type disposable diaper which is adhesively fixed in a state.
[0008]
In a particularly preferred embodiment, the outer surface material is formed of a hydrophobic sheet, and the inner surface material is formed of a hydrophilic treated sheet of a hydrophobic material. The stretchable elastic material interposed between the outer surface material and the inner surface material is formed of a stretchable nonwoven fabric having air permeability. The stretchable elastic material is formed so that the area to be attached is wider on the back (rear) side than on the abdomen (front) side. The stretch rate of the stretchable elastic material is equal to or higher than that of the waist portion.
[0009]
In the unfolded state, the covering portion is formed so that the width of the hydrophobic outer surface material is wider than the inner surface material and protrudes to both sides in the width direction, and the protruding portion of the outer surface material is formed in the inner crotch region of the covering portion. It is folded and adhered so as to cover a part of the arranged absorbent leak-proof part, thereby forming a leak-resistant part in the waist direction.
[0010]
Also, the cover ring portion is formed such that, in the unfolded state, the width of the hydrophobic outer surface material protrudes from both sides in the width direction of the inner surface material, and the elastic member is formed in a member formed by folding both ends of the protruding portion. By sealing and bonding in a stretched state, a leak-resistant portion standing upright on the waist may be formed.
[0011]
Further, a flexible tube-shaped waist elastic portion may be formed on the waist portion by being folded and adhered within a width range of the elastic material interposed between the outer surface material and the inner surface material.
[0012]
Further, it is preferable that the cover ring portion and the absorption / leakage prevention portion are bonded and integrated only at the inner crotch region and the waist portion of the cover ring portion, and the other portions are preferably in a released state.
[0013]
The diaper of the present invention may be provided with an elastic member made of spandex or thread rubber at the waist.
[0014]
The method for producing a pants-type disposable diaper proposed by the present invention is a process of unraveling and removing two sheets of air-permeable and flexible continuous outer and inner surface materials from their respective windings; A large part of the entire length of the two sheet materials is overlapped with each other, and air permeability is provided in the entire waist circumference area covering the abdomen and the back of the wearer widely except for the portion corresponding to the crotch region between the two sheet materials. Adhering the stretched elastic material in a stretched state with the sheet-like stretchable elastic material; between the liquid-permeable surface layer and the liquid-impermeable leakproof layer, the liquid-absorbing material having a smaller area than the surface layer and the leakproof layer. A separate line to form an absorbent leak-proof part having a stretchable member for forming a gathered upright portion on both sides of the absorbent layer; and a longitudinal axis of the absorbent leak-proof part is So that it is perpendicular to the longitudinal axis of the sheet material Bonding the sheet material to the sheet material at intervals and bonding at a specific position; cutting out and forming a hole for inserting a wearer's foot into the sheet material; and forming the sheet material at the center in the width direction thereof. Folding along the longitudinal axis and then sealing and welding along the line perpendicular to the longitudinal axis of the sheet material at the center of the hole into which the foot is inserted, to form pants; And cutting off the pants.
[0015]
Further, according to the manufacturing method of the present invention, when the sheet-like stretchable elastic material having air permeability is bonded between the two sheet materials, the sheet-like stretchable elastic material is attached to the abdomen (front) side and the back (rear). And adhering separately to the side.
[0016]
Still further, the manufacturing method of the present invention includes a step of stretching and bonding the stretchable elastic material adhered between the two sheet materials so that the waist portion has the same or higher stretch ratio as the other. It is a method of making pants-type disposable diapers.
[0017]
[Action]
Since the pants-type disposable diaper according to the present invention is configured as described above, it is thin and easy to attach and detach. In addition, it has a moderate elasticity to fit the entire waist, can provide a soft and good wearing feeling, and has little stuffiness even when worn for a long time.
[0018]
Further, the manufacturing method of the present invention does not require adhesively fixing a plurality of elastic yarns at small intervals, and can continuously and efficiently manufacture a pants-type disposable diaper.
[0019]
【Example】
Next, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a process for producing a pants-type disposable diaper according to the present invention. FIG. 2 shows an assembled diaper of the present invention. FIG. 3 shows a manufacturing process of the absorption / leak prevention part. 1 and 2, reference numeral 1 denotes an assembling completed product of a pants-type disposable diaper, which includes a covering portion indicated by reference numeral 2 and an absorption / leakage prevention portion indicated by reference numeral 3. The covering part 2 is formed in a pants shape and covers the waist of the wearer, and has a pair of openings 4, 4 and abdomen and back, which have air permeability and insert the feet of the wearer. And an annular waist portion 5 in contact therewith. The absorption / leakage prevention portion 3 absorbs and retains excrement of the wearer and is adhered and fixed to the inner surface of the covering portion 2.
[0020]
Hereinafter, details of each part of the diaper will be described with reference to examples.
[Covering part]
The cover ring part 2 is composed of an outer surface material 11, an inner surface material 12, and sheet-like stretchable elastic materials 13, 13a, 14, 14b adhered therebetween. Each of the two sheet materials 11 and 12 is made of a breathable, flexible and continuous sheet material that is unraveled from each winding (not shown). As shown in FIG. 1, these are formed such that, in the unfolded state, the width of the sheet material 11 as the outer surface material is wider than the width of the sheet material 12 as the inner surface material and protrudes on both sides in the width direction with equal dimensions. . Most of the entire lengths of the two sheet materials 11 and 12 are overlapped with each other, and a stretchable elastic material in a stretched state is bonded between the two sheet materials in a stretched state. As the outer surface material used here, for example, a hydrophobic sheet such as a polypropylene (hereinafter abbreviated as PP) point embossed thermal bond nonwoven fabric, a PP meltblown nonwoven fabric, and a moisture-permeable polyethylene (hereinafter abbreviated as PE) film can be used. Melt blown nonwovens are preferred. Further, as the inner surface material used here, a hydrophobic sheet such as a PP point embossed thermal bond nonwoven fabric, a PP melt blown nonwoven fabric, a hot air through thermal bond nonwoven fabric, or a hydrophilic treated sheet thereof can be used. Further, as the stretchable elastic material adhered between the outer surface material and the inner surface material, a breathable stretchable material such as a melt blown nonwoven fabric or a urethane nonwoven fabric made of a hydrogenated styrene isoprene block copolymer, that is, a stretchable nonwoven fabric (Stretchable nonwoven fabric) is preferred. As described later, a thread-like elastic member such as spandex or thread rubber can be used in combination.
[0021]
When the stretchable elastic material is bonded between the two sheet materials, the stretchable elastic material is disposed separately on the abdomen (front) side and the back (rear) side, and the stretchable elastic material is placed in the crotch region. Form no part. In addition, it is possible to adhere the stretchable elastic material so that the area of attachment is wider on the back (rear) side than on the abdomen (front) side. Further, from the viewpoint of wearability, appearance, etc., the stretch rate of the stretchable elastic material is set so that the waist portion has a higher stretch rate than the others (for example, the stretch rate is set to 3.8 times with respect to 3 times around the waist). It is preferred to stretch and adhere. As a means for bonding the two sheet materials and the elastic material, a known means such as a hot melt adhesive, ultrasonic welding, heat sealing, or the like is used as appropriate.
[0022]
[Absorption and leak prevention part]
As shown in FIG. 3, the absorption / leakage prevention part 3 is composed of a liquid-permeable surface layer 21 made of a hydrophilic non-woven fabric or the like and a liquid-impermeable leakage prevention layer made of a leak-proof film such as a PE film or a moisture-permeable film. And a liquid absorbing layer having a smaller area than the surface layer and the leak-proof layer. Both the surface layer and the leak-proof layer are made of a continuous sheet material as shown. As the absorbent layer 23, a laminate of an absorbent sheet such as a tissue, a dry pulp nonwoven fabric, or a cotton-like pulp mat is generally used. Activated carbon, carboxymethylcellulose, granules mixed with zeolite, etc.) may be used. This absorbent layer is fixed at regular intervals between the continuous sheet materials 21 and 22 as shown in the figure, and at the same time, a hydrophobic non-woven fabric 24 is bonded and fixed to both end portions of the absorbent layer. Is formed in a stretched state to form an upright gathered portion (three-dimensional gather), whereby the leak-proof walls 26, 26 can be formed. Then, while the continuously manufactured absorption / leakage prevention part moves continuously, the absorption / leakage prevention part is completed by cutting it using a cutting device (not shown).
[0023]
In addition, this absorption / leakage prevention part is manufactured as shown in FIG. 3 in a step different from the step of manufacturing the above-mentioned covering part 2, and this product is obtained by combining this as follows.
[0024]
[Relationship between covering part and absorption / leakage prevention part]
As shown in FIG. 1, the direction of the manufacturing direction of the absorption / leakage prevention part is changed by 90 degrees, and each absorption / leakage prevention part 3 is perpendicular to the longitudinal axis of the sheet materials 11 and 12. At this time, they are bonded on the sheet material at regular intervals, and bonded so that the absorption / leakage prevention portion is fixed to the inner crotch region of the cover ring portion. In this case, the covering portion 2 and the absorption / leakage prevention portion 3 are partially bonded only at the inner crotch region and the waist portion of the covering portion (only at the hatched portions in FIG. 1). In this way, instead of bonding the absorbent leak-proof part to the covering part over the entire surface, only the waist direction ends and the crotch area are adhered, and the other parts are separated, so that the elasticity of the covering part is It is less hindered by the absorption and leakage prevention part, improves the fitting property, enables the diaper to be installed well, and at the same time, prevents the absorption and leakage prevention part from being displaced from the covering part at the time of manufacturing and use. is there.
[0025]
As described above, the cover ring portion is formed such that, in the unfolded state, the width of the hydrophobic outer surface material is wider than the inner surface material and protrudes on both sides in the width direction with uniform dimensions. Is bonded back so as to cover a part of the absorption / leakage prevention portion arranged in the crotch region on the inner surface of the covering portion, whereby a leakage resistance portion 31 in the waist direction can be formed.
[0026]
[Formation of pants structure]
If the individual absorption / leakage prevention portions 3 are fixed and adhered at regular intervals so as to be perpendicular to the longitudinal axes of the sheet materials 11 and 12 as described above, then the sheet is avoided by avoiding the absorption / leakage prevention portions. An opening (hole) 4 for inserting a wearer's foot into the material is cut out and formed by a die cutter (not shown) or the like. It is preferable that the shape of the opening be a modified pentagon with rounded corners (home base type) when the cover ring is unfolded as shown in the figure, rather than a circle or an ellipse. Then, after folding the sheet material at its center in the width direction along the longitudinal axis of the sheet material, the hole 4 into which the foot is inserted is formed in order to form an annular waist portion 5 where the abdomen and the back come into contact. At the center, the seal is welded along a line 15 perpendicular to the longitudinal axis of the sheet material. As this welding means, one or both of known means such as ultrasonic welding and heat sealing are used in combination. Finally, when the pants are cut along the sealing line 15 and the pants are cut off one by one, individual pants are completed, and the manufacturing process of the pants-type disposable diaper is completed.
[0027]
[Another embodiment of the present invention]
In the above embodiment, the stretchable elastic material adhered between the outer surface material 11 and the inner surface material 12 has a gas permeability such as a melt blown nonwoven fabric or a urethane nonwoven fabric using a hydrogenated styrene isoprene block copolymer as a raw material. Although an elastic material, that is, an elastic nonwoven fabric (stretchable nonwoven fabric) is used, as another embodiment, an elastic member 32 such as spandex or thread rubber can be used in combination at the waist (see FIG. 4).
[0028]
Further, as shown in FIG. 5, in the waist portion, if the elastic member is folded and adhered within a width range where the elastic nonwoven fabric interposed between the outer surface material and the inner surface material is interposed, a flexible and flexible tubular shape is obtained. The waist elastic portion 35 can be formed, and a more favorable wearing feeling can be obtained.
[0029]
Furthermore, if the elastic member 33 is sealed in a stretched state in a member formed by folding both ends of the hydrophobic outer surface member 11 protruding from both sides of the inner surface member 12 in the width direction, and bonded, as shown in FIG. A leakage resistance portion (waist solid gather) 34 standing at the waist portion can be formed. Accordingly, the effect of preventing leakage in the waist direction is further ensured.
[0030]
【The invention's effect】
Since the present invention is configured as described above, when a diaper is used, it can be thinly and easily attached and detached, and has an appropriate stretching force to fit the entire waist, and obtains a soft and good wearing feeling. And less stuffiness when worn for a long time.
[0031]
Further, according to the diaper manufacturing method of the present invention, a breathable sheet-like stretchable elastic material, preferably a stretchable nonwoven fabric (stretchable nonwoven fabric) is stretched between the outer surface material and the inner surface material constituting the covering portion. Therefore, there is no need to adhere and fix a plurality of elastic yarns at small intervals, and a pants-type disposable diaper can be manufactured continuously and efficiently.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a diaper manufacturing process according to the present invention.
FIG. 2 is an assembled drawing of the diaper of the present invention.
FIG. 3 is a diagram illustrating a manufacturing process of the absorption / leakage prevention part.
FIG. 4 is a plan view showing a state in which a thread-like elastic member such as spandex or thread rubber is used in combination at a waist portion.
FIG. 5 is a view for explaining a step of forming a flexible and flexible tubular waist elastic portion at the waist portion.
FIG. 6 is a diagram illustrating a process of forming an upstanding leak resistance portion (waist solid gather) on a waist portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pants-type disposable diaper 2 Covering part 3 Absorption / leakage prevention part 4 Opening 5 Waist part 11 Outer surface material 12 Inner surface material 13 Sheet-like elastic elastic material 14 Sheet-like elastic elastic material 15 Seal wire 21 Liquid-permeable surface layer 22 No liquid Permeable leakproof layer 23 Absorbent layer 24 Hydrophobic nonwoven fabric 25 Elastic member 26 Leakproof wall 31 Leakage resistance part 32 Elastic member 33 Elastic member 34 Leakage resistance part (waist solid gather)
35 tubular waist elastic

Claims (3)

The cover ring comprises a cover ring part and an absorption / leakage prevention part, and the cover ring part has a pair of openings and a waist part where the abdomen and the back come into contact with each other while having air permeability and inserting the wearer's feet, The absorption / leakage prevention part has a liquid-absorption absorption layer having a smaller area than the surface layer and the leakage-proof layer, between the liquid-permeable surface layer and the liquid-impermeable leakage-proof layer, and An elastic member that forms a gathered upright portion on both sides of the absorbent layer is provided.The absorbent leak-proof portion is disposed on the inner surface of the covering portion from the abdomen to the back in the widthwise central region of the covering portion. A pants-type disposable diaper secured to at least the inseam area,
The covering portion is formed of an outer surface material, an inner surface material, and a stretchable elastic material interposed therebetween, and the stretchable elastic material is formed in a sheet shape capable of widely covering the abdomen and the back of the wearer, and furthermore, the inseam Pants characterized by being stretched and adhered to the outer surface material and the inner surface material in a stretched state around the waist including a portion where the absorption / leakage prevention portion is disposed except for a portion corresponding to a region. Type disposable diapers. The pants-type disposable diaper according to claim 1, wherein the elastic member is an elastic nonwoven fabric. Unwinding and taking out two sheets of air-permeable and flexible continuous outer and inner surface materials from their respective windings; superposing most of the total length of the two sheet materials on each other, Adhering in a stretched state a breathable sheet-like stretchable elastic material to the entire circumference of the waist surrounding the wearer's abdomen and back except for the portion corresponding to the crotch region between the two sheet materials; Between the liquid-permeable surface layer and the liquid-impermeable leakproof layer, a liquid-absorbent absorbent layer having a smaller area than the surface layer and the leakproof layer, and on both sides of the absorbent layer A step of forming an absorption / leakage prevention part having an elastic member for forming an upright gathered part on a separate line; and setting the longitudinal axis of the absorption / leakage prevention part to be perpendicular to the longitudinal axis of the sheet material. Bonding on the sheet material at intervals and bonding at a specific position; Cutting out and forming a hole for inserting the wearer's foot in the sheet material; and forming the hole for inserting the foot after folding the sheet material along the longitudinal axis of the sheet material at the center in the width direction. Forming a pants by sealing and welding along a line perpendicular to a longitudinal axis of the sheet material at the center; and cutting off the pants by cutting along the sealing line. Manufacturing method of disposable diapers.

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